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Rework the remount path to better seperate the linux vfs portion
and the xfs portion of it. Move the code to more appropriate
places in the tree.
Merge of 2.4.x-xfs:slinx:144140a originally by lord on 04/10/03
  change remount code so that it calls a vfs operation within
  XFS. reorganize the code underneath it. This better separates
  the linux vfs code and the xfs specific code and will let
  us enable more options on remount.
  add mntupdate support

/*
 * Copyright (c) 2000-2003 Silicon Graphics, Inc.  All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 * Further, this software is distributed without any warranty that it is
 * free of the rightful claim of any third person regarding infringement
 * or the like.  Any license provided herein, whether implied or
 * otherwise, applies only to this software file.  Patent licenses, if
 * any, provided herein do not apply to combinations of this program with
 * other software, or any other product whatsoever.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write the Free Software Foundation, Inc., 59
 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
 *
 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
 * Mountain View, CA  94043, or:
 *
 * http://www.sgi.com
 *
 * For further information regarding this notice, see:
 *
 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
 */

#include <xfs.h>

int
vfs_mount(
	struct bhv_desc		*bdp,
	struct xfs_mount_args	*args,
	struct cred		*cr)
{
	struct bhv_desc		*next = bdp;

	ASSERT(next);
	while (! (bhvtovfsops(next))->vfs_mount)
		next = BHV_NEXT(next);
	return ((*bhvtovfsops(next)->vfs_mount)(next, args, cr));
}

int
vfs_parseargs(
	struct bhv_desc		*bdp,
	char			*s,
	struct xfs_mount_args	*args,
	int			f)
{
	struct bhv_desc		*next = bdp;

	ASSERT(next);
	while (! (bhvtovfsops(next))->vfs_parseargs)
		next = BHV_NEXT(next);
	return ((*bhvtovfsops(next)->vfs_parseargs)(next, s, args, f));
}

int
vfs_showargs(
	struct bhv_desc		*bdp,
	struct seq_file		*m)
{
	struct bhv_desc		*next = bdp;

	ASSERT(next);
	while (! (bhvtovfsops(next))->vfs_showargs)
		next = BHV_NEXT(next);
	return ((*bhvtovfsops(next)->vfs_showargs)(next, m));
}

int
vfs_unmount(
	struct bhv_desc		*bdp,
	int			fl,
	struct cred		*cr)
{
	struct bhv_desc		*next = bdp;

	ASSERT(next);
	while (! (bhvtovfsops(next))->vfs_unmount)
		next = BHV_NEXT(next);
	return ((*bhvtovfsops(next)->vfs_unmount)(next, fl, cr));
}

int
vfs_mntupdate(
	struct bhv_desc		*bdp,
	int			*fl,
	struct xfs_mount_args	*args)
{
	struct bhv_desc		*next = bdp;

	ASSERT(next);
	while (! (bhvtovfsops(next))->vfs_mntupdate)
		next = BHV_NEXT(next);
	return ((*bhvtovfsops(next)->vfs_mntupdate)(next, fl, args));
}


int
vfs_root(
	struct bhv_desc		*bdp,
	struct vnode		**vpp)
{
	struct bhv_desc		*next = bdp;

	ASSERT(next);
	while (! (bhvtovfsops(next))->vfs_root)
		next = BHV_NEXT(next);
	return ((*bhvtovfsops(next)->vfs_root)(next, vpp));
}

int
vfs_statvfs(
	struct bhv_desc		*bdp,
	struct statfs		*sp,
	struct vnode		*vp)
{
	struct bhv_desc		*next = bdp;

	ASSERT(next);
	while (! (bhvtovfsops(next))->vfs_statvfs)
		next = BHV_NEXT(next);
	return ((*bhvtovfsops(next)->vfs_statvfs)(next, sp, vp));
}

int
vfs_sync(
	struct bhv_desc		*bdp,
	int			fl,
	struct cred		*cr)
{
	struct bhv_desc		*next = bdp;

	ASSERT(next);
	while (! (bhvtovfsops(next))->vfs_sync)
		next = BHV_NEXT(next);
	return ((*bhvtovfsops(next)->vfs_sync)(next, fl, cr));
}

int
vfs_vget(
	struct bhv_desc		*bdp,
	struct vnode		**vpp,
	struct fid		*fidp)
{
	struct bhv_desc		*next = bdp;

	ASSERT(next);
	while (! (bhvtovfsops(next))->vfs_vget)
		next = BHV_NEXT(next);
	return ((*bhvtovfsops(next)->vfs_vget)(next, vpp, fidp));
}

int
vfs_dmapiops(
	struct bhv_desc		*bdp,
	caddr_t			addr)
{
	struct bhv_desc		*next = bdp;

	ASSERT(next);
	while (! (bhvtovfsops(next))->vfs_dmapiops)
		next = BHV_NEXT(next);
	return ((*bhvtovfsops(next)->vfs_dmapiops)(next, addr));
}

int
vfs_quotactl(
	struct bhv_desc		*bdp,
	int			cmd,
	int			id,
	caddr_t			addr)
{
	struct bhv_desc		*next = bdp;

	ASSERT(next);
	while (! (bhvtovfsops(next))->vfs_quotactl)
		next = BHV_NEXT(next);
	return ((*bhvtovfsops(next)->vfs_quotactl)(next, cmd, id, addr));
}

struct inode *
vfs_get_inode(
	struct bhv_desc		*bdp,
	xfs_ino_t		ino,
	int			fl)
{
	struct bhv_desc		*next = bdp;

	while (! (bhvtovfsops(next))->vfs_get_inode)
		next = BHV_NEXTNULL(next);
	return ((*bhvtovfsops(next)->vfs_get_inode)(next, ino, fl));
}

void
vfs_init_vnode(
	struct bhv_desc		*bdp,
	struct vnode		*vp,
	struct bhv_desc		*bp,
	int			unlock)
{
	struct bhv_desc		*next = bdp;

	ASSERT(next);
	while (! (bhvtovfsops(next))->vfs_init_vnode)
		next = BHV_NEXT(next);
	((*bhvtovfsops(next)->vfs_init_vnode)(next, vp, bp, unlock));
}

void
vfs_force_shutdown(
	struct bhv_desc		*bdp,
	int			fl,
	char			*file,
	int			line)
{
	struct bhv_desc		*next = bdp;

	ASSERT(next);
	while (! (bhvtovfsops(next))->vfs_force_shutdown)
		next = BHV_NEXT(next);
	((*bhvtovfsops(next)->vfs_force_shutdown)(next, fl, file, line));
}

vfs_t *
vfs_allocate( void )
{
	struct vfs		*vfsp;

	vfsp = kmem_zalloc(sizeof(vfs_t), KM_SLEEP);
	bhv_head_init(VFS_BHVHEAD(vfsp), "vfs");
	return vfsp;
}

void
vfs_deallocate(
	struct vfs		*vfsp)
{
	bhv_head_destroy(VFS_BHVHEAD(vfsp));
	kmem_free(vfsp, sizeof(vfs_t));
}

void
vfs_insertops(
	struct vfs		*vfsp,
	struct bhv_vfsops	*vfsops)
{
	struct bhv_desc		*bdp;

	bdp = kmem_alloc(sizeof(struct bhv_desc), KM_SLEEP);
	bhv_desc_init(bdp, NULL, vfsp, vfsops);
	bhv_insert(&vfsp->vfs_bh, bdp);
}

void
vfs_insertbhv(
	struct vfs		*vfsp,
	struct bhv_desc		*bdp,
	struct vfsops		*vfsops,
	void			*mount)
{
	bhv_desc_init(bdp, mount, vfsp, vfsops);
	bhv_insert_initial(&vfsp->vfs_bh, bdp);
}

void
bhv_remove_vfsops(
	struct vfs		*vfsp,
	int			pos)
{
	struct bhv_desc		*bhv;

	bhv = bhv_lookup_range(&vfsp->vfs_bh, pos, pos);
	if (!bhv)
		return;
	bhv_remove(&vfsp->vfs_bh, bhv);
	kmem_free(bhv, sizeof(*bhv));
}

void
bhv_remove_all_vfsops(
	struct vfs		*vfsp,
	int			freebase)
{
	struct xfs_mount	*mp;

	bhv_remove_vfsops(vfsp, VFS_POSITION_QM);
	bhv_remove_vfsops(vfsp, VFS_POSITION_DM);
	if (!freebase)
		return;
	mp = XFS_BHVTOM(bhv_lookup(VFS_BHVHEAD(vfsp), &xfs_vfsops));
	VFS_REMOVEBHV(vfsp, &mp->m_bhv);
	xfs_mount_free(mp, 0);
}

void
bhv_insert_all_vfsops(
	struct vfs		*vfsp)
{
	struct xfs_mount	*mp;

	mp = xfs_mount_init();
	vfs_insertbhv(vfsp, &mp->m_bhv, &xfs_vfsops, mp);
	vfs_insertdmapi(vfsp);
	vfs_insertquota(vfsp);
}